Abrasive composition



Patented May 2e, 1925.

UNITED. STATES PATENT OFFICE.

HENRY R. POWR, F NIAGARA FALLS, NEW YORK, ASSIGNOB TO THE CABBOBUNDUM GOMIiANY, 0F NIAGARA FALLS, NEW YORK, A CORPORATION OF PENNSYLVANIA.

ABRABIVE COMPOSITION.

Ho Drawing.

To all whom it may concern:

Be it known that I, HENRY R. POWER, a citizen of the United States, residing at Niagara Falls, in the county of Niagara and 5 State of New York, have invented a new.

and useful Improvement in Abrasive Compositions, of which the following is a full, clear, and exact description.

The abrasive or grindin compositionherein referred to isfor grin ing met-a1 surfaces, such as valve seats for motor engines or for any o ration where it is proposed to make a tig t joint between two metal surfaces.

The abrasive composition I have produced is a paste made up of particles of abrasive material, water and one of that peculiar classof colloidal bodies called gums. I here refer to the true gums and use the term in 4 its strictly chemical sense.

(iums are either soluble in cold water, giving a heavy, thick, liquid, or they simply swell up in cold water. Either type of gum in water may be made into a jelly b of basic lead acetate and other chemicals, such a jelly being satisfactory to form a paste with abrasive particles. Among the chemicals that may be used with solutions of gum as thickeners to form a jelly are borax,

ammonium oxalate, mercuric chloride, iron salts, potassium and sodium silicate.

In particular, gums follow the type of arabic which is water soluble and gum tragacanth which simply swells u in water.

I prefer to use tragacant which I first form into a elly by mixing with cold water in the proportion 'of four' parts of gum to one hundred parts of water, though I may vary these proportions to get a heav- 40 ier or lighter jelly when desired. The jelly thus prepared is thickened by a very slight quantity of chemical, preferably by the use of basic lead acetate. Then the abrasive particles are stirred into the jelly, giving a smooth aste of uniform consistency.

The a vantages of this paste are that this is altogether a. cold process, no heat being required at any stage. Moreover, gums are not capable of fermentation b yeast. Hence, no preservative is req vent the abrasive compound, made as herein stated, from molding.

grease grindingthe use topre-c Application filed April 5, 1821. Serial No. 458,803.

The proportions of the abrasive-composition I have found successful'are' Water .46 I Gmm tragacanth 2 Basic lead acetate 1 Glycerine t. 2 Carborundum.

Glycerine added to the paste has a tendof the formula as herein given, depending on the size of the abrasive particles, the

strength of the paste required etc. I may,

moreover, use other than the abrasive.

V The water-mixed abrasive composition herein described has the advantage over in the fact that grease is a lubricant" and interferes 'with the cutting action of the abrasive particles, whlle the gum-jelly abrasive paste is not a lubricant and permits of a maximum amount of friction of the abrasive in the mixture.

I am aware that'it has been proposed to make a scouring composition of powdered pumice, sand or the like mixed with silicate of soda and substances such .as isinglass, gum tragacanth, starch or the like. Silicate of soda in such com sition will tend to harden and is not satisfactory for the purcarborundum as from either silicate of soda or oil, substan-,

tially as described.

3. An abrasive composition com rising abrasive rticles and a. jelly made om a sai composition being substantially particles poses for which my grinding composition is e from either silicate of soda or oil, sub- I stantially as described.

4. An abrasive composition comprising stantia abrasive particles a jelly made from a gum and g1 cerine, said composition bein subby free fnom either silicate o soda. oil, substantially as described. 5.; An abrasive compodtion comprising abrasive particles, gum tragacanfll and basic lead acetate, substantially as described.

6. An abrasive composition comprising abrasive particles, gum, basic lead acetate 10 and glycerine, substantially as described.

7. An abrasive composition consisting princi y of, abrasive a made il naglmatbickener and shy scopic substance, substantl' 'ally as 8. An abrasive composition consisting principally of abrasive a jell made from a gum, a tlu iene'r and gl'yez enne,'sul )'stant1ally as described.

\In testimony wheneof,,I have hereunto set my hand. 1

HENRYR. POWER. 

